package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.*;
import java.util.stream.Collectors;


@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;
    /**
     * 营业额统计
     * @param begin
     * @param end
     * @return
     */
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        // 当前集合用于存放从begin到end的所有日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);

        while (!begin.equals(end)){
            // 日期计算,计算指定日期的最后一天对应日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        // 存放营业额集合
        List<Double> turnoverList = new ArrayList<>();
        for(LocalDate date : dateList) {
           // 查询Date日期的营业额 营业额: 订单状态为5的订单金额
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            // select sum(amount) from orders where order_time >= beginTime and order_time < endTime and status = 5
            Map map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByOrderTime(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }
        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();
    }

    /**
     * 用户统计
     * @param begin
     * @param end
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        // 当前集合用于存放从begin到end的所有日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);

        while (!begin.equals(end)){
            // 日期计算,计算指定日期的最后一天对应日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //存放每天新增的用户数量 select count(id) from user where create_time >= begin and create_time < end
        List<Integer> newUserList = new ArrayList<>();

        //  存放总用户数量 select count(id) from user where create_time < end
        List<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap();
            map.put("end", endTime);

            // 总用户数量
            Integer totalUser = userMapper.countByMap(map);
            map.put("begin", beginTime);

            // 新增用户数量
            Integer newUser = userMapper.countByMap(map);

            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }
        return UserReportVO
                .builder().dateList(StringUtils.join(dateList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .build();
    }

    /**
     * 订单统计
     * @param begin
     * @param end
     * @return
     */
    @Override
    public OrderReportVO getOrdersStatistics(LocalDate begin, LocalDate end) {
        // 当前集合用于存放从begin到end的所有日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);

        while (!begin.equals(end)){
            // 日期计算,计算指定日期的最后一天对应日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        // 存放每天的订单总数
        List<Integer> orderCountList = new ArrayList<>();
        // 存放每天的有效订单总数
        List<Integer> validOrderCountList = new ArrayList<>();

        // 遍历dateList集合,查询每天的有效订单数和订单总数
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            // 查询每天的订单数量 select count(id) from orders where order_time >= begin and order_time < end
            Integer orderCount = getOrderCount(beginTime, endTime, null);
            // 查询每天的有效订单数量 select sum(id) from orders where order_time >= begin and order_time < end and status = 5
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);

            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }

        // 计算时间区间内的订单总数
        Integer totalOrderCount = 0;
        for (Integer TotalOrderCount : orderCountList) {
            totalOrderCount += TotalOrderCount;
        }

//        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        // 计算时间区间内的有效订单数量
        Integer validOrderCount = 0;
        for (Integer TotalOrderCount : validOrderCountList) {
            validOrderCount += TotalOrderCount;
        }

//        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();
        Double orderCompletionRate = 0.0;
        if (totalOrderCount != 0) {
            orderCompletionRate= validOrderCount.doubleValue() / totalOrderCount;
        }

        OrderReportVO orderReportVO = OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();

        return orderReportVO;
    }

    /**
     * 销量排名top10
     * @param begin
     * @param end
     * @return
     */
    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        List<GoodsSalesDTO> list = orderMapper.getSalesTop10(beginTime, endTime);

        List<String> name =list.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList()); ;
        String nameList = StringUtils.join(name, ",");

        List<Integer> number = list.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(number, ",");
        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                        .build();
    }

    /**
     * 根据状态统计订单数量
     * @param begin
     * @param end
     * @param  status
     * @return
     **/
    private Integer getOrderCount(LocalDateTime begin, LocalDateTime end, Integer status) {
        Map map = new HashMap();
        map.put("begin", begin);
        map.put("end", end);
        map.put("status", status);
        return orderMapper.countByMap(map);
    }

    /**
     * 导出营业数据
     * @param response
     */
    @Override
    public void exportBussinessData(HttpServletResponse response) {

        //查询数据库, 获取作业数据---查询30天的营业数据
        LocalDate begin = LocalDate.now().minusDays(30);
        LocalDate end = LocalDate.now().plusDays(1);
        // LocalDateTime.of() 将数据转换成LocalDateTime
        BusinessDataVO businessDataVO =workspaceService.getBusinessData(LocalDateTime.of(begin, LocalTime.MIN),LocalDateTime.of(end, LocalTime.MAX));

        //通过POI将数据写进Excel文件
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        try {
           // 创建Excel模版
            XSSFWorkbook workbook = new XSSFWorkbook(in);

            // 获取表格文件的sheet页
            XSSFSheet sheet = workbook.getSheet("Sheet1");

            // 设置时间
            sheet.getRow(1).getCell(1).setCellValue("时间:"+begin + "至" + end);

            // 获得第4行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());

            // 获得第5行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            for (int i = 0; i < 30; i++){
                LocalDate date = begin.plusDays(i);
                // 查询某一天的营业数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                // 获得某一行
                row = sheet.getRow(7+i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

            // 创建输出流, 通过输出流将数据写入到浏览器
            ServletOutputStream out= response.getOutputStream();
            workbook.write(out);

            out.close();
            workbook.close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}
